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Genetic relationship between hydrocarbon system evolution and Carlin-type gold mineralization : insights from ReOs pyrobitumen and pyrite geochronology in the Nanpanjiang Basin, South China.

Ge, Xiang and Selby, David and Liu, Junjie and Chen, Youzhi and Cheng, Guofan and Shen, Chuanbo (2021) 'Genetic relationship between hydrocarbon system evolution and Carlin-type gold mineralization : insights from ReOs pyrobitumen and pyrite geochronology in the Nanpanjiang Basin, South China.', Chemical geology., 559 . p. 119953.

Abstract

The spatial association of hydrocarbons with metalliferous ore deposits is found worldwide and is particularly common to Carlin-type gold systems. Both liquid oil and pyrobitumen are found in Carlin-type gold deposits of North Nevada, USA and the Nanpanjiang Basin, South China. However, the temporal and genetic association of hydrocarbons and gold mineralization are still debated. To this end, using rhenium‑osmium (Resingle bondOs) geochronology of pyrobitumen and gold-bearing pyrite from the Laizishan and Banqi reservoirs and the Yata Carlin-type gold deposit in the Nanpanjiang Basin, we consider hydrocarbons played a critical role in the mineralization process. A Resingle bondOs age of 228 ± 16 Ma obtained for highly mature pyrobitumen suggests that liquid oil cracking occurred during the Late Triassic in the Laizishan and Banqi reservoirs. This age is in agreement with the modelled thermal history of the Nanpanjiang Basin. Additionally, a broadly identical gold-bearing pyrite Resingle bondOs age of 218 ± 25 Ma from Yata Carlin-type gold deposit which is in agreement with ages reported for other Carlin-type gold deposits in the Nanpanjiang Basin (e.g., in-situ SIMS Usingle bondPb rutile = 213.6 ± 5.4 Ma, Resingle bondOs arsenopyrite = 204 ± 19 Ma - 235 ± 33 Ma and Rbsingle bondSr illite = 212.8 ± 4.6 Ma) suggests the auriferous Carlin-type systems of the Nanpanjiang Basin also formed during the Late Triassic. Integrating our Resingle bondOs data, with recent liquid hydrocarbon experimental data and fluid inclusion data from both reservoirs and gold deposits within the Nanpanjiang Basin, a methane (CH4) dominated thermochemical sulfate reduction (TSR) process, which introduced hydrogen sulfide (H2S) into basinal fluid and ultimately led to the deposition of gold-bearing pyrite by sulfidation, is considered to be the genetic link between of pyrobitumen and gold-bearing pyrite mineralization of the Carlin-type systems of the Nanpanjiang Basin.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.chemgeo.2020.119953
Publisher statement:© 2020 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:21 October 2020
Date deposited:05 November 2020
Date of first online publication:24 October 2020
Date first made open access:24 October 2021

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